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Old 01-28-2018, 02:14 PM
My Toy My Toy is offline
Join Date: Aug 2016
Location: Maryland
Posts: 13
Default Cleaning carbine gas cylinder without removing staked piston nut ?

Is there any definitive way to clean the gas cylinder on an M1 carbine without removing the staked piston nut. I drizzle some Hoppe's along side of the piston, work the piston back an forth, then invert to allow the sooty Hoppe's to drain. I do this several times until I get drainage with very little burn powder soot.
What do you do; or do you basically leave it untouched?
I know you really don't want to gum up the piston with a lot of lubricant.
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Old 01-28-2018, 02:21 PM
6 Ring 6 Ring is online now
Join Date: Apr 2010
Location: South of Atlanta, Ga
Posts: 3,063

If piston moves at all and sometimes if it does not, firing it will move the piston and hot gas at 55,000 psi will clean it. The piston does not have to move "freely". Do not do anythng to it. No lubricants, etc.
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Old 01-28-2018, 02:30 PM
DaveHH DaveHH is offline
Join Date: Nov 2009
Posts: 4,705

You will open that thing up and inside will be spotless. Then you will wonder why you took the thing apart and risked screwing up the nut and gas cylinder. Some of them look scary: half in, half out, some are perfect and staked as per factory. Taking it out is a reasonable solution to a non existent problem.
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Old 01-28-2018, 04:54 PM
meplat meplat is offline
Join Date: Jan 2010
Location: Prescott, AZ
Posts: 3,817

You can. Just soak the barrel/gas chamber in solvent of your choice, wire the piston in the depressed position, plug the chamber and blow compressed air through the barrel. Or just skip the wire and shoot it. 40K psi is nothing to sneeze at. Untamed it can blow stocks apart. You will likely get some black mess inside the stock. Oh well, just don't use your "collector" stock for "cleaning".

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Old 01-28-2018, 05:29 PM
HB of CJ HB of CJ is offline
Join Date: Nov 2011
Location: 42N -123W OR USA Kinda
Posts: 1,230
Default Best To Leave It Alone? ...

This applies only to the USGI barrels. If the Carbine functions properly just leave it alone. Like already said the very high pressure gas does a good job of keeping the gas port and cylinder clean.

But if you have sluggish function and everything else checks out OK just vise up the barrel and use that piston nut wrench to remove the nut. Penetrating oil overnight helps. The piston should be free.

If not then try carburetor cleaner. Remove the piston and nut. Be careful. A 0.070 diameter drill bit finger spun through the gas port will remove the crud. If not use a small brace. Clean it out.

My old spring tube Rock Ola shaved lead from cast bullets. No bore scopes back then. Every 500 rounds or so I had to drill clean the gas port. Quick. Easy. Switching to Lake City ball cured it.

Red Loctite or other high temp thread sealant might NOT work to keep the nut in place. Our M2 gets quite hot and we use no sealant. No staking either. Just wrench finger tight with checks.

All Oregon State, US Code Laws And NFA Rules Apply.
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